book Maths Puzzle Numerical Ability

A top spins 200 revolutions/minute. Find the angular velocity in radians/second.

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book Other Question

How many yards of felt will I need total to make 8 slipcovers that are 43 1/2 inches long and 19 inches wide? how many pints of a 40% salt solution must be added to 12 pints of 20% salt solution to end up with a 32% salt solution